O.S. engine MAX-25LA Einrichtungshandbuch

It is of vital importance, before attempting to

operate your engine, to read the general

'SAFETY INSTRUCTIONS AND WARNINGS'

section on pages 2-6 of this booklet and to strictly

adhere to the advice contained therein.

●Also, please study the entire contents of this

instruction manual, so as to familiarize yourself

with the controls and other features of the

engine.

Keep these instructions in a safe place so that

you may readily refer to them whenever

necessary.

It is suggested that any instructions supplied

with the aircraft, radio control equipment, etc.,

are accessible for checking at the same time.

●

CONTENTS

SAFETY INSTRUCTIONSAND WARNINGS

ABOUT YOUR O.S. ENGINE

INTRODUCTION

INSTALLATION OF THE ENGINE

INSTALLATION OF SILENCER

BEFORE STARTING

ADVICE ON SELECTION OF FUEL,

GLOW PLUG & PROPELLER

STARTING THE ENGINE

RUNNING-IN (Breaking-in)

TROUBLE SHOOTING WHEN THE

ENGINE FAILS TO START

CARE AND MAINTENANCE

OPTIONAL PARTS & ACCESSORIES

10LA ENGINE EXPLODED VIEW &

PARTS LIST

15/25LA ENGINE EXPLODED VIEW

& PARTS LIST

CARBURETTOR EXPLODED

VIEW & PARTS LIST

10LATHREE VIEW DRAWING

CARBURETTOR

15/25LA CARBURETTOR

AIR-BLEED ADJUSTMENT

15/25LATHREE VIEW DRAWING

Remember that your engine is not a "toy", but a highly efficient internal-

combustion machine whose power is capable of harming you, or others, if it is

misused.

As owner, you, alone, are responsible for the safe operation of your engine, so act

with discretion and care at all times.

If at some future date, your O.S. engine is acquired by another person, we would

respectfully request that these instructions are also passed on to its new owner.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

The advice which follows is grouped under two headings according to the

degree of damage or danger which might arise through misuse or neglect.

WARNINGS NOTES

These cover events which

might involve serious (in

extreme circumstances, even

fatal) injury.

These cover the many other

possibilities, generally less obvious

sources of danger, but which, under

certain circumstances, may also

cause damage or injury.

WARNINGS

Model engine fuel is poisonous. Do not

allow it to come into contact with the eyes

or mouth.Always store it in a

clearlymarkedcontainerand

out of the reach of children.

Never operate your engine in an en-

closed space. Model engines, like auto-

mobile engines, exhaust deadly carbon-

monoxide. Run your engine only in an

open area.

Model engines generate considerable

heat. Do not touch any part of your

engine until it has cooled. Contact with

the muffler (silencer),

cylinder head or exhaust

header pipe, in particular,

may result in a serious burn.

•

Never touch, or allow any object to come

into contact with, the rotating

propeller and do not crouch

over the engine when it is

running.

A weakened or loose propeller may

disintegrate or be thrown off and, since

propeller tip speeds with powerful

engines may exceed 600 feet(180 metres)

per second, it will be understood that

such a failure could result in serious

injury, (see 'NOTES' section relating to

propeller safety).

•

Model engine fuel is also highly

flammable. Keep it away from open flame,

excessive heat, sources of sparks, or

anythingelsewhichmightignite

it.Donotsmokeorallowanyone

else to smoke, near to it.

•

NOTES

•

This engine was designed for model

aircraft. Do not attempt to use it for any

other purpose.

Mount the engine in your model securely,

following the manufacturers' recommenda-

tions, using appropriate screws and lock-

nuts.

Be sure to use the silencer (muffler)

supplied with the engine. Frequent

exposure to an open exhaust may

eventually impair your hearing.

Such noise is also likely to cause

annoyance to others over a wide area.

Fit a top-quality propeller of the diameter

and pitch specified for the engine and

aircraft. Locate the propeller on the shaft so

that the curved face of the blades faces

forward-i.e. in the direction of flight. Firmly

tighten the propeller nut, using the correct

size wrench.

If you remove the glowplug from the engine

and check its condition by connecting the

battery leads to it, do not hold the plug with

bare fingers.Use an appropriate tool or a

folded piece of cloth.

NOTES

•

Always check the tightness of the propeller

nut and retighten it, if necessary, before

restarting the engine, particularly in the

case of four-stroke-cycle engines. If a

safety locknut assembly is provided with

your engine, always use it. This will prevent

the propeller from flying off in the event of a

"backfire", even if it loosens.

If you install a spinner, make sure that it is

a precision made product and that the

slots for the propeller blades do not cut into

the blade roots and weaken them.

Preferably, use an electric starter. The

wearing of safety glasses is also strongly

recommended.

•

•Discard any propeller which has become

split, cracked, nicked or otherwise rendered

unsafe. Never attempt to repair such a

propeller: destroy it. Do not modify a propeller

inanyway,unlessyouarehighlyexperienced

in tuning propellers for specialized

competition work such as pylon-racing.

Take care that the glow plug clip or battery

leads do not come into contact with the

propeller. Also check the linkage to the

throttle arm. A disconnected linkage could

also foul the propeller.

After starting the engine, carry out any

needle-valve readjustments from a safe

position behind the rotating propeller. Stop

the engine before attempting to make other

adjustments to the carburettor.

•

NOTES

•

Adjust the throttle linkage so that the engine

stops when the throttle stick and trim lever

on the transmitter are fully retarded.

Alternatively, the engine may be stopped by

cutting off the fuel supply. Never try to stop

the engine physically.

Take care that loose clothing (ties, shirt

sleeves, scarves, etc.)do not come into

contact with the propeller.Do not carry loose

objects (such as pencils, screwdrivers, etc.)

in a shirt pocket from where they could fall

through the propeller arc.

Do not start your engine in an area

containing loose gravel or sand.

The propeller may throw such material in

your face and eyes and cause injury.

For their safety, keep all onlookers

(especially small children) well back (at

least 20 feet or 6 meters) when preparing

your model for flight. If you have to carry

the model to the take-off point with the

engine running, be especially cautious.

Keep the propeller pointed away from you

and walk well clear of spectators.

Warning! Immediately after a glowplug-

ignition engine has been run and is still

warm, conditions sometimes exist whereby

it is just possible for the engine to abruptly

restart if the propeller is casually flipped

over compression WITHOUT the glowplug

battery being reconnected. Remember this

if you wish to avoid the risk of a painfully

rapped knuckle!

INTRODUCTION

THEMAX-10LA,15LA,25LAhave been developed to

meet the requirements of beginners and sport

flyers.

Of modern design and having a separate needle-

valve unit mounted at the rear, where manual

adjustment is safely remote from the rotating

propeller, they offer the advantages of reliability

and easy handling, at lower cost. Like all O.S.

engines they are built to standards of engineering

excellence that have evolved through more than 60

years' experience in the design and production of

model internal-combustion engines. Advanced

modern precision machinery, top quality materials

and the efforts of highly skilled craftsmen and

techniciansare combined to ensurea continuation

of the levels of performance, durability and

reliability for which O.S. is world famous.

The 'midnight blue' external finish may be

decolorized by very high surface temperature or

by certain solvents. Such decolorization does not

affect engine perfor-mance, however.

Cylinder head

Carburettor

Silicone Tubing

Crankshaft

Propeller nut

Propeller washer

Drive Hub Crankcase

Needle valve

Cover Plate

Fuel outlet

Fuel inlet

Glowplug

Connect the short length of fuel tubing supplied

securely between the fuel outlet and the fuel inlet. In

the event of the tubing becoming damaged, it should

be replaced with a suitable length of best quality 5mm

ODX2mm ID silicone tubing. Use similar material to

connect the fuel inlet nipple to the fuel tank.

INSTALLATION How to fasten the mounting screws.

Hardwood mounting beams

O.S. radial motor mount

(cast aluminum)

Tighten second nut firmly

down onto first nut.

Tighten this nut first.

Steel washer

3mm steel screw

Spring washer or

lock washer

12mm min.

Hardwood such as

cherry or maple.

Spring washer

3mm steel Allen screw

Front view

CORRECT

Side view

Top surfaces are in the

same plane. Re-align the surfaces

as necessary

INCORRECT

Top surfaces are not

in the same plane. Opposite beam

Top surfaces

are not in the

same plane.

Engine does

not rest firmly.

Rigid hardwood

(e.g. maple)

Installation in the model

A typical method of beam

mounting is shown below,left. O.S. radial motor mount

(Available as an optional extra part.

See parts list)

Make sure that the mounting beams are parallel

and that their top surfaces are in the same plane.

At least

12mm(1/2")

At least

12mm(1/2")

3mm steel nuts

NEEDLE-VALVE EXTENSION

The needle-valve supplied with these engines is

designed to incorporate an extension so that, when

the engine is enclosed within the fuselage, the

needle-valve may be adjusted from the outside.

Cut a commercially available rod to the required

length, bend one end to an L shape, insert it into

needle's center hole and secure it by tightening the

set-screw in the needle-valve knob with 1.5mm. Allen

key.

The angled exhaust of the silencer can be rotated to

any desired position in the following manner:

1) Loosen the locknut and assembly screw.

2) Set the exhaust outlet at the required position by

rotating the rear part of the silencer.

3) Re-tighten the assembly screw, followed by the

locknut. The standard silencer is quite effective but

reduces power to some degree.

INSTALLATION OF SILENCER

Assembly screw Cone baffle

Turn to requlred position

Exhaust outlet

Locknut

Exhaust pressure nipple

Modelenginesgenerateconsiderableheat.Do

not touch any part of your engine until it has

cooled. Contact with the muffler (silencer),

cylinder head or exhaust header pipe, in

particular, may result in a serious burn.

Reminder!

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